/*
 * SVG Salamander
 * Copyright (c) 2004, Mark McKay
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or 
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 *   - Redistributions of source code must retain the above 
 *     copyright notice, this list of conditions and the following
 *     disclaimer.
 *   - Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials 
 *     provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE. 
 * 
 * Mark McKay can be contacted at mark@kitfox.com.  Salamander and other
 * projects can be found at http://www.kitfox.com
 *
 * Created on January 27, 2004, 2:53 PM
 */

package com.kitfox.svg.xml;

import java.awt.Color;
import java.awt.HeadlessException;
import java.awt.Toolkit;
import java.io.File;
import java.io.Serializable;
import java.net.URI;
import java.net.URL;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.kitfox.svg.SVGConst;

/**
 * @author Mark McKay
 * @author <a href="mailto:mark@kitfox.com">Mark McKay</a>
 */
public class StyleAttribute implements Serializable {
	public static final long serialVersionUID = 0;

	static final Pattern patternUrl = Pattern.compile("\\s*url\\((.*)\\)\\s*");
	static final Matcher matchFpNumUnits = Pattern
			.compile(
					"\\s*([-+]?((\\d*\\.\\d+)|(\\d+))([-+]?[eE]\\d+)?)\\s*(px|cm|mm|in|pc|pt|em|ex)\\s*")
			.matcher("");

	String name;
	String stringValue;

	boolean colorCompatable = false;
	boolean urlCompatable = false;

	/** Creates a new instance of StyleAttribute */
	public StyleAttribute() {
		this(null, null);
	}

	public StyleAttribute(String name) {
		this.name = name;
		stringValue = null;
	}

	public StyleAttribute(String name, String stringValue) {
		this.name = name;
		this.stringValue = stringValue;
	}

	public String getName() {
		return name;
	}

	public StyleAttribute setName(String name) {
		this.name = name;
		return this;
	}

	public String getStringValue() {
		return stringValue;
	}

	public String[] getStringList() {
		return XMLParseUtil.parseStringList(stringValue);
	}

	public void setStringValue(String value) {
		stringValue = value;
	}

	public boolean getBooleanValue() {
		return stringValue.toLowerCase().equals("true");
	}

	public int getIntValue() {
		return XMLParseUtil.findInt(stringValue);
	}

	public int[] getIntList() {
		return XMLParseUtil.parseIntList(stringValue);
	}

	public double getDoubleValue() {
		return XMLParseUtil.findDouble(stringValue);
	}

	public double[] getDoubleList() {
		return XMLParseUtil.parseDoubleList(stringValue);
	}

	public float getFloatValue() {
		return XMLParseUtil.findFloat(stringValue);
	}

	public float[] getFloatList() {
		return XMLParseUtil.parseFloatList(stringValue);
	}

	public float getRatioValue() {
		return (float) XMLParseUtil.parseRatio(stringValue);
		// try { return Float.parseFloat(stringValue); }
		// catch (Exception e) {}
		// return 0f;
	}

	public String getUnits() {
		matchFpNumUnits.reset(stringValue);
		if (!matchFpNumUnits.matches()) {
			return null;
		}
		return matchFpNumUnits.group(6);
	}

	public NumberWithUnits getNumberWithUnits() {
		return XMLParseUtil.parseNumberWithUnits(stringValue);
	}

	public float getFloatValueWithUnits() {
		NumberWithUnits number = getNumberWithUnits();
		return convertUnitsToPixels(number.getUnits(), number.getValue());
	}

	static public float convertUnitsToPixels(int unitType, float value) {
		if (unitType == NumberWithUnits.UT_UNITLESS
				|| unitType == NumberWithUnits.UT_PERCENT) {
			return value;
		}

		float pixPerInch;
		try {
			pixPerInch = Toolkit.getDefaultToolkit()
					.getScreenResolution();
		} catch (HeadlessException ex) {
			// default to 72 dpi
			pixPerInch = 72;
		}
		final float inchesPerCm = .3936f;

		switch (unitType) {
		case NumberWithUnits.UT_IN:
			return value * pixPerInch;
		case NumberWithUnits.UT_CM:
			return value * inchesPerCm * pixPerInch;
		case NumberWithUnits.UT_MM:
			return value * .1f * inchesPerCm * pixPerInch;
		case NumberWithUnits.UT_PT:
			return value * (1f / 72f) * pixPerInch;
		case NumberWithUnits.UT_PC:
			return value * (1f / 6f) * pixPerInch;
		}

		return value;
	}

	public Color getColorValue() {
		return ColorTable.parseColor(stringValue);
	}

	public String parseURLFn() {
		Matcher matchUrl = patternUrl.matcher(stringValue);
		if (!matchUrl.matches()) {
			return null;
		}
		return matchUrl.group(1);
	}

	public URL getURLValue(URL docRoot) {
		String fragment = parseURLFn();
		if (fragment == null) {
			return null;
		}
		try {
			return new URL(docRoot, fragment);
		} catch (Exception e) {
			Logger.getLogger(SVGConst.SVG_LOGGER).log(Level.WARNING, null, e);
			return null;
		}
	}

	public URL getURLValue(URI docRoot) {
		String fragment = parseURLFn();
		if (fragment == null) {
			return null;
		}
		try {
			URI ref = docRoot.resolve(fragment);
			return ref.toURL();
		} catch (Exception e) {
			Logger.getLogger(SVGConst.SVG_LOGGER).log(Level.WARNING, null, e);
			return null;
		}
	}

	public URI getURIValue() {
		return getURIValue(null);
	}

	/**
	 * Parse this sytle attribute as a URL and return it in URI form resolved
	 * against the passed base.
	 *
	 * @param base
	 *            - URI to resolve against. If null, will return value without
	 *            attempting to resolve it.
	 */
	public URI getURIValue(URI base) {
		try {
			String fragment = parseURLFn();
			if (fragment == null) {
				fragment = stringValue.replaceAll("\\s+", "");
			}
			if (fragment == null) {
				return null;
			}

			// ======================
			// This gets around a bug in the 1.5.0 JDK
			if (Pattern.matches("[a-zA-Z]:!\\\\.*", fragment)) {
				File file = new File(fragment);
				return file.toURI();
			}
			// ======================

			// [scheme:]scheme-specific-part[#fragment]

			URI uriFrag = new URI(fragment);
			if (uriFrag.isAbsolute()) {
				// Has scheme
				return uriFrag;
			}

			if (base == null) {
				return uriFrag;
			}

			URI relBase = new URI(null, base.getSchemeSpecificPart(), null);
			URI relUri;
			if (relBase.isOpaque()) {
				relUri = new URI(null, base.getSchemeSpecificPart(),
						uriFrag.getFragment());
			} else {
				relUri = relBase.resolve(uriFrag);
			}
			return new URI(base.getScheme() + ":" + relUri);
		} catch (Exception e) {
			Logger.getLogger(SVGConst.SVG_LOGGER).log(Level.WARNING, null, e);
			return null;
		}
	}

	public static void main(String[] args) {
		try {
			URI uri = new URI(
					"jar:http://www.kitfox.com/jackal/jackal.jar!/res/doc/about.svg");
			uri = uri.resolve("#myFragment");

			System.err.println(uri.toString());

			uri = new URI("http://www.kitfox.com/jackal/jackal.html");
			uri = uri.resolve("#myFragment");

			System.err.println(uri.toString());
		} catch (Exception e) {
			Logger.getLogger(SVGConst.SVG_LOGGER).log(Level.WARNING, null, e);
		}
	}
}
